Someone who blindly follows the so called metagame, or short: meta of an online
multiplayer game. Metafags are the whiny types who complain that you take or use a currently unpopular weapon / strategy or character. The annoying thing about this attitude is, that the meta is being developed by high level
professional players, and is thus not as significant for casual players who play the game
recreationally and just want to have fun and play the game like they please.
While playing
overwatch:
Player1: I will play Soldier.
Player2: No! You musst pick McCree Soldier is not in the
current meta!
Player1: Dude, don't be a metafag!